Telephony.



M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED 001"9,1912.

Patented Sept. 1, 1914.

FIG. 1

WITNESSES IjNVEN'l on W MM ORTON L. JOE-SON M. L. JOHNSON.

TH EPHONY,

ArPtluArluN llLflI) 001.9 1912v 1,109,167, Patented Sept. 1. 1914.

5 SHEETS SHEET 2.

3% W W LW WITNESEES INVENTOR W61? B1;4ORTON L. JOHNSON ATTORNEY M. L. JOHNSON.

TELEPHONY.

APPLIUATION FILED 0019,1912.

1 1 O9, 1 67. ted ept. ,1, 1914.

5 SHBETSSHEET 3.

W97 2 T N LLJOHNSQN jay. A'IIOBREY M. L. JOHNSON.

'I'ELEPHQNY.

APPLICATION rum) own 1912.

1, 1 O9, 1 6'7, Patented Sept. 1,1914.

5 SHEETS*SHEET 4.

, 5 j Y H 44 fi Z If 2 4e 4 ia 47 H I M a FIG. 4:

wrrsms sms INVENTOK l lori'rox L. JOHNSON BY 1 i W ATTORNEY M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED OCT.9, 1912. 1,109,167, Patented Sept 1,1914.

5 SHEETS-SHEET 5.

INVENTOR DLOR'TON. JOHNSON.

WITNESSES ATTORNEY Ma a h.

UNITED STATES PATENT OFFICE.

MORTON L. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOR. BY MESNE ASSIGNMEI-ITS. TO

FRANK B. COOK COMPANY, OF CHICAGO,

ILLINOIS, A CORPORATION OF ILLINOIS.

TELEPHONY.

Specification of Letters Patent.

Patented Sept. 1, 1914.

'0 if iii/HIM it may concern Be it known that I; Mon'roN L. JOHNSON, p'itiZcn ot' the United States, residing at thicago. in the county of Cool: and State of Iilinois. have invented a certain new and useful Improvement iii/Telephony, of which the following is a full, clear, concise. and exact description, reference being had to the act-out inving drawings, forming a part of this pec- -cation.

My invention relates to telephone ex change systems and has for its object the provision of improved automatic mechanism that may be set into operation by operators for the purpo e of extending telephone lines.

is the invention is embodied calling telephone lines are extended into connection with called telephone lines that constitute the form of telephone line extensions with which in) invention is of particular service. though I do not wish to be limited to the nature of the calling line extensions that are added to the calling lines nor do I wish to be l iiitcd to the extension of calling lines that extend to subscribers stations in the practice of my invention.

In the preferred eml'iodiment of the invention l employ link selector switches 1 adapted to select idle link connectors which are to form parts of telephone tween telephone lines and their ultimate cxtensions- These link connector switches are set inm opt-ration hr operator controlled;

sr tc thcl ontrol,

' uiccha p rmit iointly by the opcrntor switching nicelu iisui and mocha oi io 7 part of the link schclors. i'vluaw' \Ull'i l i i switches art cmplo zcl tln are also set into operation hr the opcrtors equ pment and :iru arrcstml in. connection "with the w ait'ingcontacts that pertain called lines jointly by the operator controlled switching incchanisn'i and nicohai'iism torming part of the coninzctor switches.

In practising hie embodiment of the invention herein disclosed the portions of the linl; selector and (mincetor switches that cooperate with operators switching mechanism for the purposes stated are in the form of armature switches pertainin; to relays or magnets entering into the formation ol the selector and connector switches. though I do not limit myself to this characteristic in all enihodimcnts of the invention.

The svstcm heroin disclosed is a species of circuits lit l and they are arrcstcd to the 1 l the generic invention set forth in ou col pending application Serial No. 724.753: tiled October 9, 1912 (Case N).

The circuits for arresting; the switches are individual to the extensions of the calling lines thereby affected and are individual to the various positions to which the circuit 3 extending portions of the switches are phn'ed 1 so that troubles introiiluccd by circuits that l are common to more than one c mic l tl arresting the switches are elin'iiuatcd In practising my invention the lin extending switch is caused to operate a device which is adapted to operate in conjuin-tion with one of a nunihcr of operato controlled devices that; are individual to thrtiili'crcut positions of the line extending switch to arrest the line extending switch in the position ct'irrcsponding to the actuated operator con trolled device. A switch controlled devi'e is brought successively into such relation i with the operator controlled devices that it will cooperate with. the :n'tuated one of the operator controlled devices for the purpose stated. 'l 'hc e operator controlled devices I are included in controlling circuits that are temporarily made individual to the ditl'erent positions ot' the line extending switch and the di'li'crcnt linli connectors.

l will explain my iownliou m re fully v llilcitlttt to the acct:uipanji'iug drawings lshowiiltf thc preferred cmlwiliincut ol' the invention and in which Figure l a sin'iplilicd \iew dis losing lHt" invert" Figs. i l and 5' taken row-c2 1 their numerical order. illustrate a ti-lcph nc 'stcui equipped in acmr hu'uthe iuiciuiim. Figs. 1. i and t eing oi --z-i..irioii with each other with the hoax con-Junior at the top portions filmy-ro n no while Figs. l and :u wl with each Otlltl with the co! ing lengthwi e oi l i l. izi aliucincui won the conductors iliscontiiuicd at the ii ojht hand long side of Fig. i. p l The invention is clearly suggested to. the diagram sh wn in Fig. l. the portions ot' tlu- S YHltl'it not illustrated in Fig. l twin illustraiwl in the remaining ligures. i will not descri e Fig. l in detail owing to the description that will be given in connection l with the rcuiainintr figures and in conncc' L tion with which description of the remaindiagraunuat ii d ner: loaii ii... H's (All tuging figures Fig. 1 may readily be read as similar parts in the dill'erent figures have similar characters of reference.

in describing the inventi n as disclosed in Fig. l. the. party at the calling station, 211

for example. will. as a conscquciue of tho j remmal of the receiver at the calling stal wipcrs oi an automatically operating operator selector tion from its switch hook, set the switch into operation until the wipers 1 and 2 ot this automatically perating switch becomes arrested in connection with the telo phone I) connected to the waiting contacts engaged by the wipers 1 anl 2 of the operator selector switch \vherel 1 such selected op erator is able to communicate with the calling subscriber to ascertain the number of the line desired by the calling subscriber. Each operator has a key (3 that serves to set the wipers of a link selector switch A into operation. these wipers continuing to move ia'tically until they are arrested by means to be described. .ie vertical magnet 13 automatically operates to efi'ect the elevation of the wipers of this selector switch. A and in so doing intermittently opcrat the switch 7 to intermittently ground it against its contact thereby intermittently establishing a circuit that includes a con-- troller magnet 5 the cmitroller magnet 8, being intermittently energized. efl'ccting the. operation of the. mot r magnet 8 that ct fects the rotation of the arm or wiper 5''. The arm Si is thus brought to positive positions corresponding to the vex-tiara positions of the wiper of the link selector switch A. Vvaiting contacts are located at the various positions to which the arm 9 is brought. These waiting contacts are connected with stationary contacts 01 operators keys that are distri uted in three vertical rows B D. The arm 9 is grounded so that the statimr ary contacts of the keys B C D are grounded when the waiting contacts with which the stationary contacts are connected are en gaged by the grounded arm 9. Through the medium of elcctro-magnetic mechanism and circuits established by conjoint opera tion of the arm 9, its waiting contacts, and the keys in the row B, the operation of the relay 12 may be effected to arx'st the vertical movement of the. wipers of the. switch A at a level corresponding to the level of the actuated key at B. The upper key in the row B serves to arrest the wipers of the switch A after they have been moved to the first level. The next key in this row serves to arrest these wipers in their second level, the next key in the third level, the next key in the fourth level, etc, there being as many keys in the row B as there are levels to which the wipers in the switch A may be stepped. After the wipers in the switch A have been brought to their proper level these Wipers areautomatically rotatively stepped around, until the wipers 13 and 141 engage the waiting contacts of the idle link connector that terminates in talking wipers 15 and 1G. The key 6 will now serve to set the wipers 15, 16 and 17 of the cmincctor switch into operation, thesc wipers continuing to move vertically until th y are. arrested by int-ans to be described. the vertical magnet U) of the connector switch automatically operating to aise the wipers oi the connector s itch until the magnet is interrupted in its operation through the agency of the elements 8. $5. and a key in the row C corrcsponding to the level at which the wipers at the connector switch are to be arrested, the vertical magnet 70 intcrn'iittcntly effecting the operation of an armature switch whi h cooperates with the relay 8 in a manner similar to the cooperation between the armature switch 7 and the. relay 8. The upper key of the row C serves to arrest the wipers ot' the connectorswitch after they have been moved to the first level. The next key serves to stop these wipers at the second level. the next key in the third level, the next key in the fourth level, etc., there being as many keys in the row C as there are levels to which the wipers in the connector switch may be stepped. WVhcn the connector switch wipers have been brought to the level that contains waiting contacts belonging to the desired line. say the line extending to station 912. these wipers are stopped around until the wipers 15 and 16 engage the waiting contacts of. the desired line. This result is accomplished with the aid of the key 6, and the circuit controlled by the rotary magnet 78 operating to effect the movement of the arm 9. When the wipers of the connector switch have been brought to the level containing the waiting contacts of the desired line, these wipers are autoii'iatically rotated as a consequence of the operation of the key (3 and suitably associated mechanism later to be described. The armatureswitch of the rotary magnet 78 is intermittently operated by this rotary magnet as said magnct performs its function in order intermittently to establish cirunit through the re ay 8 thereby to effect the step by step movement of the arm 9, this operation of the arm 9 being similar to that eii'ccted by the vertical magnet 7 and the "ertical magnet 43. The rotation of the wipers 15, 16, etc., ceases when circuit has been established through the arnr!) and the depressed key in the row I) corresponding switch hook 20 and its alternate contact which may be traced 'om the grounded common battery 21, the upper winding of relay 22, the uppermost armature switch of relay 23 and its normal contact, the upper intermediate armature switch of relay 2-1 and its normal contact, both sides of the calling line, the lower intermediate armature switch of relay 24 and its normal contact, the lower armature switch of relay and its normal contact, to the lower grounded coil of relay 22. The relay 22 thereupon attracts its armature switches, circuit being established which may be traced from the intermediate grounded armature switch of relay '22 and its alternate contact, the armature switch of the sluggishly operating relay 2?), the winding of this relay, the winding of rotary magnet 26, the side switch wiper 27, to the grounded battery 21, the illustration of this battery being repeated many times for the sake of clearncss. hen the rotary magnet 26 is energized it sets wipers 1, 2, 28 and 29 of the operator selector switch into operation until the wiper 29 encounters an ungrounded waiting contact whereupon these wipers will become arrested with the wipers 1 and 2 engaging the waiting contacts constituting terminals of conductors leading to an idle opcrators telephone 5. The wipers 1, 2, 28 and 29 are arrested as described owing to the'opening of the circuit for the private magnet 30 when the wiper 29 engages an ungrounded waiting contact, the circuit for this magnet 30 having been initially established upon the initial cnergization of the rotary magnet When the private magnet. 30 is dci nergizcd the side switch wipers 27 and 3 are stepped into their second and final positions. The side switch wiper 31 is grounded, when in its second position, so as to ground the waiting contact engaged by the wiper 29 and all other similarly positioned multiply related contacts of other operator selector switches so that no operator selector switch can be operated by any other calling sul'iscriber in a manncr to become connected with the opcrators telephone 5 that has become counccted with the calling subscriber 211. \Vhcn the side switch wiper 27 is in its second position circuit for the rotary n'iagnet 26 is opened so that the wipers 1, 2, 28 and 29 will remain with the'wipcrs 1 and 2 in connection with the telephone 5. A. sin'nal 32 maybe employed at each operators position to have circuit closed tberethrough i whcn an operator's telephone 5 is sclcctcd in the nianncr which has been described. circnit governing this signal ii being traceable from the side switch wiper 31 when groundcd in its second position, the wiper 29. the l wailing contact engaging thc same, the winding of relay 33, to the grounded battery 21. The relay S3 thereupon attract its armature switch to close circuit for the signal 32, which circuit is apparent. The operator being in telephonic communication with the calling subscriber ascertains the wants of the calling subscriber and for the sake of illustration it is assumed that the calling subscriber desires communication with the subscriber at station The oporator will depress the second key from the top of row B, the top key of row G, and the second key from the topo'f row 1), these kcys remaining depressed either by the hand (:1 the operator or by automatically released means, whet-cutter the operator momentarily depresses the selllrclea ing key 6 (see fig.

2). Key (l, though the last dcprcssed, the first. to become eti'ective, it serving to eti'cct the elevation of the wipers of the link selector switch A (Fig. 4). The key 6, when dc pressed establishes a circuit which may be traced from the grounded spring of this toy, the two contacts lo the right of this spring that are coiniected when the key is depressed, the follow-up normal contact of the armature switch immediately to the right of the relay 34, to the grounded battery 21. This armature switch engages its alternate contact to establish a. locking circuit through the relay 3-1, which locking circuit may be traced from the grounded battery 21, the relay ii, the said armature switch and its alternate, contact. to the left hand grounded armature switch of the sluggishly operating relay 35. circuit is also established that may be traced from the grounded spring ot the key 0. the contact next adjacent thereto, the winding of sluggishly operating relay :36, to the grounded battery 21. When relay 3 5 is energized it establishes a circuit which may be traced from the grounded baltery 21, the alternate contact. of the right hand armature switch of this relay 3t), the second armature switch to the right of relay 31 and its alternate contact, the talking wiper 2 and the waiting contact. engaged thcrcl'iy, the intermediate armatureswitch of relay 37 and its normal contact, the wind-- ing oi relay 38, the intermediate armature switch of private magnet 30, and its nor mally engaged contact. to the grounded lower coil of relay The relay 38 is thereupon operated to establish a circuit which is traceable from the grounded battery 21, the armature switch of relay 38, the winding of relay 37, to ground. A locking circuit is established for relay 3? which is traceable from the grounded coil of this relay through its lowermost armature switch and its now engaged contact, the contact engaged by the side switch wiper 27 in its second position. said side switch wiper, to the grounded bat lcry 21. \Vhen relay 37 is op ated it breaks connection between the calling line and the 1 op rator at the two uppcr armature switches of relay 37 interposed between the wipers 1 and 2 and the calling substation. By break- I operate.

phone 5 is nowdisconnected from these telel phone conductors such telephone conductors may be employed in effecting connection between calling and called lines. The slug: gishly operating relay 36 become restored, after the key 6 is released and restores itself, as a consequence of which the circuit is established which is traceable from the left hand grounded armature switch of relay 36 and its engaged contact, the left hand armature switch of relay 31 and its engaged contact, the right hand armature switch of relay 39 and itsnormaily engaged contact,the winding of relay 10, to the grounded battery 21. When the relay 40 is thus energized a circuit is established which is traceable from the left hand grounded armature switch of relay 40, its then engaged contact, the right hand armature switqh .of sluggishly operating relay 41, and its normally engaged contact, the armature switch of relay 36 and its now enaged contact, the third armature switch from the right of relay 34 and its' now engaged alternate contact, the talking coriductor leading to the .waiting contact now engaged by the wiper l, the wiper 1, the upper armature of relay 37 audits alternate contact, the upper intermediate armature switch of relay -12 and its normal contact, the winding of relay 12, to the grounded battery 21. Circuit for the vertical magnet 13, that is employed to elevate the wipers 13, i

14 and 44, is now established and may be traced from the grounded battery 21 through the circuit interrupter 45, the vertical mag net 13, the lower intermediate armature switch of relay 4G and its normally engaged contact, the lowermost armature switch of relay 12 and its now engaged contact, the lowermost armature switch of relay 42, to ground. The vertical magnet 46 is intermittently energized owing to the circuit interrupter 45 and is therefore intermittently operated to step the wipers 13, 14 and 44 to different levels. Owing to the circuit interrupter 45, the wipers of the switch A pause. in each of the lerels to which they have been raised a sufiicient length of time to permit the vertical magnet 43 properly to operate the relay 8, to permit the relay 8 to close the circuit of the motor magnet 8 at a sulii ciently slowrate of speed so that the magnet.8 will operate at a sufficiently slow rate of speed to permit the arm 9 to'remain in engagement with its waiting contacts during suitable periods, in which periods the electro-magnetic mechanism whose circuits are governed bythe arm'9 may properly The circuit established by the vertical magnet 43 through the relay 8 is traceable from the grounded contact of the armature switch 7, this armature switch, the lower intermediate armature switch of relay 42 and its normal contact, the intermediate armature switch of the relay 3? and its alternate contact, the wiper 2 and the contact-engaged thereby, the second switch to the right of relay 34 and its alternate con-.

tact, the right hand switch of relay 36 and its normal contact, the winding of relay 8 to the grounded battery-21. The relay 8 attracts its armature switch to close the obvious circuit through the motor magnet 8 The motor magnet 8 has its armature pro vided with an actuating pawl that moves the ratchet wheel 8'-as the motor magnet 8 is upon the shaft of the ratchet wheel 8 In theconnection between calling and called subscribers that is being described the vertical magnet 43 is to be operated but twice in order to bring the wipers 13, 11 and 44: of the switch A to the second level, to which end the second key from the top of the row B is depressed to prevent these wipers from moving higher than the second level, the switch arm 9establishing a circuit when it is engaged with its second waiting contact which is traceable from the grounded arm 9, the second waiting contact engaged thereby, the stationary contact of the second key from the top row 13, the contact spring of this key, the sluggishly operating relay 41, the now attracted right hand armature switch of relay 40 to the grounded battery 21. Circuit for. the relay 12 is consequently opened at the right hand armature switch of relay 41. When the circuit of relay 12 is opened its armature switches are released and a ground is momentarily applied to the coil of relay 46 owing to the sluggish release of relays? which has its circuit previously closed at the upper armature switch of relay 12 and the alternate contact of this armature switch. Circuit for relay 46 is traceable from the grounded battery 21, the Winding of relay 46, the still attracted armature switch of sluggishly operating relay 4?, the upper armature switch of relay 12, to ground by way of the normal contact of this latter armature switch.

A locking circuitis established for relay 46 which is traceable from the grounded battery 21, the winding of the relay 46, the upper intermediate :ll'llltttlll'GHYitCll of rela} 16 and its now engaged contact, the uppermost armature switch of relay 42 and its normal follow-up contact, to the right 'hand grounded armature switch of sluggishly operating relay 48, which armature switch has been attracted to engage ts con- 'tact, circuit for the relay 48 having been previously established at the lowermost intermittently energized. The arm 9 is fast armature switch of relay Q2. The circuit or the vertical magnet 48 has now been opened at two poinls. the lower intermediat :H'IIHUHO switch ol' relay l6 and the lowe armature switch o'l relay 12 so that inc r i crs ot' the switch A remain in l cl in hicli they have been brought. The

relay l0. when it is energized, includes the 4.) in a circuit which is tracethe nccted with ground through battery and:

which has no direct connection with ground. the waiting contacts of the wiper ll being di ctly grounded. when the link circuits asalcd with these waiting, contacts are tc. i when thee link circuits are idle. When the wiper it engages a waiting contact that i not directly grounded. the slugdy operating" relay 51 is energized by a orcuii iluiclldl trom the grounded battery 2] (Fig. .n operating: relay 5:2. the normal follow-up con act of the upper armature switch of re- 33 and said :wmature switch. the waitinn contact cngragcd by the wiper -14. the uppermost armature switch of relay 4(3 and its ahcrnatc contact. the winding of slugg'ishly opcrzuing relay 51. to ground. The relay Til thereupon establishes a circuit which is t aceable from its grounded armalay turc switch. the contact engaged thereby.

the winding of relay 42. to the groui'lded batt ry 3i. "1 1c relay l2 establishes a lockmgr circuit which may be traced from the grounded attery it. the wirding of the relay 41 the upperm st a mature switch of this relay and its alternate contact. the

armature sni h of relay 4Q and its then 011- \Vhon the relay graced contact to ground.

l. is cncrgi/cd it opens the circuit for the rotary mag-act l9 at the lowermost arma tuic switch of relay L5 whereupon the Wipers arc lu'ought to iih the idle link circuit. \Yhen the link circuit is busy the associate waiting contacts belonging to the wiper ll are connected directly with ground either at the. armatur switch of relay 49 (Fig. 3) or at the itch ot (DQYQlZQd uppermost armature sw V sluggishly (narrating relay 54. which relay and being grounded only through batthe windingot sluggishly 1 rest in connection l l l l l l i l i i is energized by a circuit traceable from tho grounded battery 21, the winding oi the rclay 54-. to ground. the relay ha ing; been energized in a manner which will later bc dc c ilcd. XVhen the buttons of the wiper l-l are limited to direct connection with ground the relay 51 will olwiously not be energized so that the rotary magnet ll) will continue in operation. When relay 42 is energized the locking circuit for the relay it) is broken by the separation oi its upper armature switch from its normal tollow-up contact whereby the relay 4.6 restored to normal. the decnergization of the relay 46 enabling the grounded armature switch 48 to become connccted with the wiper H by a path traceable from the grounded armature switch of relay 1%. the uppermost armature switch of relay l2 and its alternate contact. the uppermost armature switch of relay 46 and its normal contact. to said wiper ll. \Vhen the relay 4'2 is energized the intermediate armature switches thereof connect the talkin; wipers 13. 14. with the wipers l and 2. When the relay 41 (Fig. 2) is energized, a circuit is established which may be traced from the grounded contact ot the intermediate armature switch of this relay and said armature switch. the normal loll w-up contact of the intermediate armature switch of relay 39 and this armature switch. the winding of relay 39. to ground by way of battery 21. A locking circuit is established for the rclay 39 which is traceable from the grounded battery 21. the winding of relay 39. the intermediate armature switch ot this relay and its alternate contact, the left hand armature switch of relay ll and its pr viously engaged contact. to the left. hand grounded armature switch of relay 3n and its contact. \Vhen the relay ll energized its left hand armature switch establishes: a. circuit traceable from its grounded contact and this switch. the normal lollowam contact ot the right hand armature switch of relay 9. the winding of this r lay to the grounded battery 21. The relay 9 establishes a locking circuit tor itselt traceable trom the gr unded battery 21, through the relay 8 the alternate contact of the right. hand armature switch of this relay. the arm 8*. to the grounded contact engaged by this arm when the ratchet wheel 8 is moved upon its first step. The let't hand armature switch of relay 8 establishes the obvious circuit through the release magnet, 8, this release magnet withdrawing: the holding pawl from engagement with the ratchet whec $33 so that the coiled sprin with which the ratchct wheel is prmidcd may restore its ratchet wheel to normal position as illustrated in Fig. whereby the contact arm 5) is restored to the normal position illustrated. 'hcn the parts are in normal position the arm 9* has been discuc'afjed from its grounded contact so that the locking circuit for thc relay 8 is opcu. \Vhen relay IXE) is energized circuit tor relay is opened at t right hind ::.mature ilif switch of relay E59. \Yhcn the relay i0 is l t a the brush 56, the brush 58 engaged with the disk 57 momentarily once in eachrevolution of the disk 57 which is rotated by a motor 59, the left hand armature switch of relay 39 and its contact, the left hand armature switch of relay (30 and its normal follow-up contact, the winding of relay 60, to the grounded battery 21. A locking circuit is established for the relay 60 which is traceable from the grounded battery 21, the 1 winding of relay (50, the left hand arniaturc switch of this relay and its alternate contact, the left hand armature switch 'of relay 34 and its then engaged contact, to the left hand grounded armature switch of relay 36 and its then engaged contact. The

relay 60, when thus energized, effects the establishment of a circuit which is traceable from the brush G1, the driven disk 62, the brush ()1 momentarily engaged with the disk 62 once in each revolution of such disk, the right hand armature switch of relay 60 and its then engaged contact,

ing of relay 69, to the grounded battery 21. Circuit for the vertical magnet T0 of the connector switch is consequently included in a closed circuit traceable from the ground ed battery 21, the interrupter Tl, the wind-- 'ing of the vertical magnet Til. the sluggishly operating relay T2, the lower armature switch of relay 73 and its norn'iai co ct, the lower armature switch of relay 6a and its contact. to the grounded lower armature switch of relay 53, and its contact.

The vertical magnet int nit'tcntl energized, a result of the. ogera ill of th j circuit interrupter 71. to bring ill-1: wipers of the connector switch to the lewl mntain ing the waiting contacts of the desirei'l or to be called line. The extent to which the wipers of the connector switch may be elevated is determined by the key in the row Ll which has been depressed. In this case. tl" called subscriber being No. the up most key in the row C has been depre rd so that when the wipers of the connector switch have been raised to the first level they will be raised no further. This is owing to the establishment of a circuit traceable from the grounded armature switch of the vertical magnet of the connector switch and its enthe right hand ari'nature switch of relay 64 and its follow-up contact, the wiruling of relay 6st, to the grounded battery 21. A locking circuit is established for the relay (it which is traceable from the grounded battery 21, the winding of the relay 64. the right hand armature switch of this relay gaged contact, the lower intermediate armature switch of the relay 68 and its normal contact, the wiper 1-1 of the switch A. and its engaged waiting contact, the lower inter-- mediate armature switch of the relay and its alternate contact. the intermediate armature switch of the relay 37 and its alternate contact, the wiper 2 and. its engaged waiting 1 contact, the second switch from the right of and its alternate contact, the intermediate armature switch of relay 60 to its ground ed contact. \Vhcn the relay G4 is energized a circuit is established which is traceable from its left hand armature switch and the grounded contact then engaged thereby, the 1 relay 8i and its alternate contact, the right hand armature switch of relay 536 and its nornnil, contact. the relay 8, to the grounded battery 21, the relay 8 operating to more the arm 9 tl'irough the inerinediatiou of the i relay and electromagnetic niecl'ianisn'i preright hand armature switch of relay 65 and j its engaged contact, the winding of relay (36, to the grounded battery 21. The relay 66, when energized establishes a circuit traceable from its left hand grounded armature switch and the contact engaged thereby, the right hand armature switch of sluggishly operating relay 67 and the contact engaged thereby, the intermediate armature switch of relay 36 and the contact engaged thereby, the third armature switch to the right of relay 34 and the alternate contact engaged thereby, the waiting contact engaged by the wipcr'l, the upper armature switch of relay 3? and its alternate contact, the upper intermediate armature switch of relay 42 and its alternate contact, the wiper 13, the upper intermediate armature switch of relay 68 and its normal contact, the windyiously described. The arm 9 is moved to the first waiting contact accompanying the Vertical moy'ement of the wipers of the connector switch to their first level and as the top key of row C has been depressed in order to arrest the wipers of the connector switch at the first level, a circuit established which is traceable from the grounded arm 9 and the first contact engaged thereby. the stationary contact ofthc upper key in row (7 and the winding of sluggishly operating relay (3?, the right hand armature switch of relay (36, to the grounded battery 21 by way of the grounded contact. \Vhen the relay 67 is energized the circuit which was previously traced from the left hand armature switch of relay 66 and the relay 69 is open at the right hand armature switch of relay 67. When the circuit of relay 67 is opened, its upper-grounded armature switch engages its contact, a circuit being momentarily established through relay i3 owing to the sluggishness of relay T2, this circuit being traceable from the upper grounded a1" mature switch of relay 69 and its contact, the armature of sluggishly operating relay T2 to the grounded battery 21. The relay 73 establishes a locking circuit for itself which is traceable from the grounded battery 2t through the winding of the relay 73, the upper armature switch of this relay. and its contact, the upper armature switch of relay 3 and its normal follow-u contact, the wiper it and its engage waiting contact. the upper armature switch of relay 4b and its normal contact, the upper armature switch of relay t2 and its alternate contact. the armature switch of relay 48 and its contact. to ground. \Vhen relay T3 is energized circuit for the vertical magnet opened at the lower armature switch of relay 7? and its normal contact, such circuit also being opened at the lowermost. armature switch of relay 69 whereby vertical moyei'nent of the wipers of the connector switch ceases. these wipers having been brought to the level which contains the waiting contacts of the desired line. hen the relay 6? is energized its left hand arma- 4 ture switch operates to effect the restoration of the arm 9 to normal in a manner similar to that which \"as described in conncction with the left hand armature switch of relay ll. Then relay ()7 was energized it established a circuit at its intermediate armature switch traceable from the grounded contact of this armature switch through the switch, the intcrn'iediate armature switch of relay of and its normal follow-up contact. the winding oi this relay to the grounded battcry 21. The relay 65 establishes a locking circuit for itself which is traceable from the grounded battery "21 through its intermediate armature switch. the alternate contact of this switch. to the let't hand armature switch of relay (i-l and its thcn engaged grounded contact. \Yhcn relay ()3 is energiZed a ci cuit is established traceable front the grounded brush 56 through the disk 57, the brush 5% when engaging the disk. the left hand armature its engaged contact. the lel't hand armature switch of relay T and its normal followup contact. the winding of relay T4. to the grmindcd battcry ill. The relay T-l establishes a locking circuit for itself traceable from the grounded battery 2i through the winding ol' relay i l the left hand arn'iature switch of this relay and its alternate contact,

the lrl't hand aririature switch oi relay 3% to the left hand 36 by and. its engaged contact, grounded armature switch of relay of u: :rgqgu edict. The relay T l, ha. ing been cnergrlicd. establishes a clrcurt traccablc dish 0:, the brush 63 when engaging the switch ot relay (35 and from. the grounded brush -1, the i and its contact, the Winding of relay 73 I l l l l l l l l l disk, the right hand armature switch of relay H and its engaged contact. the normal l'ollowmp contact of the right hand armature switch of relay TS), to the grounded battery' 21. l circuit for itself traceable from the grounded battery 21 through the winding of the relay, the right hand armature switch of this relay the alternate contact of this armature switch, the intermediate armature switch of relay 7%, to the grounded contact engaged by this intermediate armature switch. Relay 75 now establishes a circuit traceable from the grounded battery 21 through the relay T6, the let't' hand armature switch of relay 75, to the grounded contact engaged by this armature switch. The relay T6 establishes a circuit traceable rom its left hand grounded armature switch. the contact engaged thereby. the right hand armature switch of sluggishly operating relay 7? and the contact engaged thereby. the intermediate armature switch of relay 3G and the contact engaged thereby. the third armature switch from the right of relay 3i and the alternate contact engaged thereby. the wiper l and the waiting contact engaged thereby. the upper ar mature switch of relay 3? and the alternate contact engaged thereby, the upper intermediate armature switch of relay 4) and the alternate contact engaged thereby, the wiper 3 and the waiting contact engaged thereby. the upper intermediate armature switch of the relay 8 and the normal contact engaged thereby. the relay 69, to the grounded battery 21v The relay 69 now establishes a circuit for the rotary magnet 78 which serves to rotate the wipers of the connector switch, this circuit being traceable from the lower grounded armature switch of relay 53 and the contact engaged thereby, the lower ar1na turc switch of relay 69 and the contact engaged thereby. the lower armature switch of relay 7?) and the alternate contact engaged thereby. the sluggishly operating relay TO, the rotary magnet 78, the interrupter 71. to the grounded battery 21. The wipers of the connector switch now rotate step by step in the level to which they were previously raised until the wipers of the connector switch are rotated to engage the Waiting contacts belonging to the le sired line. To this end the rotary magnet 79 is caused intcrn'iittently to establish circuit through the relay 5 in a manner which will now be understood to etlect the step by step movement of the arm 9 by the appara tus which has been described. When the arm 9 has been stepped to engage its second waiting contact. a circuit is established (owing to the depression of the second low born the top of the rcw D) r liich is l rarrablc fr m the grounded arm 9. the second waiting contact engaged thereby the stationary contact of the kcysccond fronrthetop or the ror i),

i energized relayTT operates to restore the 'one second in duration.

arm 9 to normal this operation being similar to that described as having been 'accomplished by the left hand armature switch of relay 41. \Vhen the relay 69 is deenergized its upper armature switch establishes acircuit which is traceable from ground, the upper armature switch of relay 69, the contact engaged thereby, the right hand armature switch of sluggishly operating relay 79, the'winding of relay 53, the winding of relay 68, to the grounded battery 21;

The relay 53 establishes a lqcking circuit for itself and for the relay 68 which is traceable i'rom the grounded battery 21, the windings of these two relays, the upper armature switch of relay 53 and its right hand alternate contact, the wiper 44 and the waiting contact engaged thereby, the uppermost armature switch of relay 46 and its normal contact. the uppermost armature switch of relay 42 and its alternate contact, the right hand armature switch of relay 48 and its contact, to ground. Circuit for the rotary magnet 78 is now open at the lower armature switches of the relays 53 and 69 so that the wipers of the connector switch are arrested with the wipers 15 and 16 in connection with the waiting contacts belonging to the desired line No. 212. It will be observed that the disks 57 and 62 have peripheral. projections for engagement with the brushes 58 and 63.' These peripheral projections are.so angularly displaced that a considerable interval of time will elapse between the connection of the brush 58 with the disk 57 and the subsequent connection of the disk 62 with the brush 63. I preferably cause this, time interval to be about This interval of time will be sui ficient'to allow the wipers of the idle link selector switch A toseek an idle link atterthese wipers have been raised to the desiredlevel. This time interval is also employed to enable'the relays of the connector switch to perform their switching functions after the wipers of the connector switch have been raised to their desired level. The relay 77 establishes a circuit at its left hand armature switch through the sluggishly operating relay 35. The energizcd relay 35 establishes a circuit which may be traced from the grounded battery 21, the right hand armature switch of relay 35, the wiper 28 and the contact engaged thereby, the lowermost armature switch of the private magnet 30 and its engaged contact, the relay 24, to the grounded armature switch of relay 48 by way of its contact. The relay 24 establishes a locking circuit for itself traceable from the grounded battery 21, through the lowermost armature switch of relay 24 and its engaged contact, the winding of relay 24, the armature switch of relay 48 and its' contact, to ground. When the relay 24 is operated the ground connection previously established by the relay .48 for establishing the circuit of the relay 24 is removed but is replaced by the grounded upper armature switch of the sluggishly operating relay 54 in a manner to be described. When relay 24 is energized circuit for relay 22 is opened at the intermediate armature switch of relay 24 whereby the relay 22 is denergized to release its armature switches. Circuit for the release magnet 80 of the idle operator selector switch is established at the intermediate armature switch of relay 22 when engaging its normal contact, the off normal switch 81 having previously been closed. All of'the wipers 1, 2, etc., of

the idle operator selector switch that was employed to connect the calling subscriber 211 with the telephone equipment 5. attracted left hand armature switch of relay 35 opens the locking circuit for the relay 34 to restore it to normal. Locking circuits for the relays 39, 60 and 74' are opened at the left hand armature switch of the deenergized relay 34 to restore these relays 39, 60 and 74 to normal. The relays 64, 65, 75 and 7 6 are consequently restored to normal whereby all of the operators equipment which was employed in extending the calling line is restored to normal. 'When the wiper 29 is restored to normal circuit for the relay 33 is opened to restore it to normal. \Vhen relay 24 is energized it connects the sides of the calling line, at its intermediate armature switches, with the talking conductors leading to the wipers 13 and 14 by way of the alternate contacts of the intermediate armature switches of the relay 24. When relay 68 is energized its armature switches are attracted to become connected with their alternate contacts whereby the waiting contacts engaged by the wipers 13 and 14 are connected with the talking "conductors that extend to the talking wipers The switch of relay 68 and its alternate contact, the wiper 13 and its engaged waiting contact, the upper intermediate armature switch of relay 42 and its alternate contact, the upper intermediate armature switch of relay 24 and its alternate contact, the telephone receiver, transmitter and switch hook at the calling station 211 and the alternate contact of this switch hook, the lower intermediate armature switch of relay 24 and its alternate contact, the lower intermediin'e armature switch ot relay 42 and its alternate contact, the wiper It and it engaged waiting contact. the lower intermediate armature switch of relay 68 and its alternate contact, to the grounded lower coil of relay 55. The relay serves to energize relay 54 by a circuit ealabliehcd by way of the upper armature switch of relay 55'. lVhen relay 54 is energized its upper grounded armature switch engages its contact to replace the ground removed at 48 from the relays 24', 42, 53 and (3H. \Vhen the wipers of the connector switch have become eonnceted the called line wiper S3 of the connector switch e tal'r lislica a circuit which may be traced from the grounded battery 21. the winding of relay 84, the alternate contact of the arma tnre switch of relay 85, the wi )cr 83, the uppermost armature switch of re ay 24 pertaining to the called line and its normal contact (Fig. 3). the upperinoet armature witch of relay 2'2 pertaining to the called line and its normal contact. the relay 2?; pertaining to the callcd line, to the grounded battery 21. the circuit l'nr relay 85 having previously been momentarily catabliened at the lower contact of the eluggxiahly operatine; relay 79 and tho relcaid uppcr armatnre switch of relay 69. The relay *4 will not be cncrojivnd if the desired line tree for connection with lhc calling: line since the upper terminal of the winding! ol relay l is not ('orinccicd with any dirccl ground when the deeircd line ie 'l'i'cc but i;--- only w nnectcd with thc name t rminal of the batter Bl with which the lowcr lcrminal of the winding: of relay I' l is z-onncctcd. When the desired lliic is busy the upper terminal of relay 4 is; comc 't "l dirc lly with ground at the upper .lllliiilll't r. itch of r 9 lay fi l oi an ther onnc tor wit h in case the desired line is a m-iion-ly call -il line. It the desir d lllll in itrlcll' ll Cilllllly lin tlnupper terminal of H e rclay 84 i\ -onnct-lcd directly with ground at thc uppci'nio,--:l armature switrh n! rclay i8" ll l'iIlllilll'I t the desired linc arid he alt rna e i fiwe of this; uppcrmoet armature will or. Il on atage oi the conn ction. ilri (l ne-t 'g rnund is 1 established by the uppcrrnwi switch of relay 2:? pertaining lo the desired line andits alternate ground d contact. When the relay 84' is energized, whi h in the armatur may be tract-d 'l'roi'n the alternate contact of case when the desired line is busy it establishes a locking circuit for itself which ii traceal-Jle from the grounded battery Al. the winding of relay 84-, the armature switch in'nnediatcly above the winding of relay til and the contact engaged by this armature i-iw teh. the upper armature switch of relay and the contact then engaged thereby, to ground. The relay 81- then becomes effective -to placia busy tone upon the telephone circult leading back to the calling line. This in ay thin ice is applied. to the line by means of tlw bridgiconnection established between the talking sides of the line leading hack to the calling line, which bridge connection the lower int rmediate armature switch of relay 8. Tin condenser 86, the secondary 8. to the alternate Hamlet of the second armature switch above d e winding of relay The liner is a-tiectwi by means of he circuit inruptor #55 in circuit wiih the primary rl i tlic oatiery 2] in the of with r it it no the calling snh: rglicr i'e:-tor-:'-,,-: it v aie receiver upon ita witcl'i ht to 1 re the equipmen wt was cn'iployed t rilei'it the transfer of the busy tone to the l station, the restora tion of thin app being explained later.

fining; th; e lt l line is free for use ilic rel r rennin inert and the eutoll' rc! inning: to the desired line d an as to prevent the t-ih asaoeiated with the a l clllfl operated when the The circuit for the r l-points, l illillli to the called line tl'ilis' 1 r tram-aide from the grounded atter 2i through the winding of relay 23 oi the called line, the uppermost armature :wu'it l: l ii-lay 32 of the called line and its a! rvntait. the uppermost ai-inat=iri-, ol' ml. 15 and its normal ont I and it engaged \\:iitin 2 i:. I tzn-i. t n vizrzrit w switch of relay hf ,d iir normal :wnitzicti the uppermost :irinatio'c \n ii i of relay 8i and its contact. the uppcr arnzainrc awi'tch of relay (i3 and it left hand alternate contact. t the grounded uppc" armature switch of relay it and ite cuu'ai gcd contact. The called snhscribcri; decal hull JO is included in circuit with the arcncrzitor ll owing: to the (IlPl'Lfl/Jltlflil ol ilarelay J13 which as ellcctcd by a irtrarcablc from the lower armature ewitch oi relay 7 nd it ynzjaged void-mi. th lower swit h i relay l tlhl lie g-glgi-ifrrl cont-n t tlic lnwii hl llt'll in P lar llf-l and iton g'ri g ml cwnln'li the wind hen l'ZitFiP'l/tl. r l

. i l "itllttl 1 in}, be traced the ringing iiit g 'ronirlcd to iln- Lili'ai lizlit generator 91, the alternate contact of the upper armature switch of relay 92, the wiper .16 of the connector switch and its engaged waiting contact, the lower armature switch of relay 23 of the called line and its alternatc contact, the lower intermediate armature switch of relay 24 of the called line and its normal contact. the switch hook 20 of the called. line. the normal contact of this switch hook. the condenser 9i (employed to maintain circuit through the relay normally open when the telephone receiver is upon the switch hook). the signal bell 90. the upper intermediate armature switch of relay ill of the called line and its normal contact. the upper armature switch of relay 723 of the called line. and its alternate contact, the wiper 1:- ol' the employed connector switch and the waiting contact engaged there n. the upper armature switch of relay 92 and its alternate contact, the winding of relay 95. the circuit interrupter 96 employed to ell'ect intermittent-operation of the signal llll. back to the generator 91. The relay 95 is of such resistance and adjustment that it will not be operated by current passing from the generator 91 through the called suhscribefs bell and the associate. condenser 94. hen the called subscriber removes his telephone from its switch llOOli the continuous path through the called subscribers receiicr and trans mitter is substituted for the path including the condenser J1 and hell 0. this substitute path being oi sntliciently low resistance to permit the current from generator 91 operati ely to energize the relay 97 \Vhen the relay 95 's energized a circuit is established which is traceable from its grounded armature switch and the contact thcn engaged thereby, the winding of relay 93. to the grounded battery 21. When the relay is energized it establishes a locking circuit for itself traceable from the grounded battery ll. the intermediate armature switch of relay 3 and its engaged contact, to the grounded upper arnmtnrc switch of relay 54 by way oi its engaged contact. When the relay 9?) is energized it opens a. circuit at its lower armature switch tor the relay 92. The relay 9:) thereupon releases its armature FwlYltCillrlo cut the generator 91 out of circuit to connect the talking wipers l5 and ll; of the counrct r switch with the sides of the callin; line in a manner that will be nndcrsiood iron] the d agram and to restore th relay -i. When the call d subscriber responds a rizcuit is establirln-d through the relay 9? which may be traced from the lower grounded terminal of this relay through the lowermost armature switch of relay 68 and its engaged contact, the'lower intermediate armature switch of relay 8 and its normal contact, the lower armature switch of relay 92 and its normal contact, the talking Wiper 16 of the connector switch. the lower arma ture switch of relay 23 of the called line and its alternate contact. the lower intermediate armature switch of the relay 2% of the called line and its normal contact. the tch hook 20 of the called line and its a.- tact, the telephone receiver and nsmit-ter at the called stati iin, the upper u'iu-rinediatearmature switch of relay fi l oi the called. line and its alternate contact. the wiper 1 ol' the connector switch and its engaged waiting contact, the upper annatnre switch of relay 9). and its normal contact, the second switch from the top of the winding of relay R4 and its normal contact, the uppermost switch of relay 68 and its enga ed contact. the upper winding of relay 9 to the grounded battery 21. A second circuit is now established for the relay 5i traceable l'rom the lower grounded switch of the relay E i and its engaged contact, the winding of relay 54, to the grounded battery 21, whereby this relay 54 is under the joint control of the calling and called stations and is not dei nei gized until the receivers at both stations are restored upon their switch hooks. When both subscribers have restored their receivers upon their switch hooks the calling suhscribers relay and called subscribers relay 97 are deenergizcd so that both energizing circuits for the relay 54 are open and this relay 54 is de'e'nergized. The upper grounded armature switch of relay 54 is thus disconnected so as to remove ground from the cutoff relay 23 of the called line, relays 93, 53, (58, 42 and 24 of the calling line. lien relay 4-2 is dei nergized its lower armature switch establishes circuit for the release magnet 99 ot' the idle link selector,

switch A by way of the previously closed oil normal switch 100. this circuit being apparent. The wipers of the idle link selector switch are restored to normal. lVhen relay .rl is dci nergized ground is established at its low er armature switch in connection with the release magnet 101 of the en'iployed connector switch. this circuit including the previously closed oil normal switch 102. When circuit through the release magnet 101 is established the wipers of the con nector switch are restored to normal. All the equipment pertaining to the calling and called line and the apparatus that connected these lines is now restored to normal.

The relay 82 may he termed a. supervisory relay since it is ol service in operating any equipment in bridge of the comluctors eX-- tending to the ialling station to indicate whether the called party has responded or not.

In the enihodinic tit al the invention illustrated the instrument whose operation is effected by the relay is the calling subscribers telephone receiver, though obviously such an instrument might be a supervisory relay in a manually controlled link it such llilh were included in a telephone circuit. Prior to the response of the called subscriber a circuit, is present which inludes the grounded circuit interrupter 103, the uppermost armature switch of relay 93 and its normal contact. the uppermost armature s\\ itch ot relav 9i and its engaged. contact, the winding of relay S2 and the grounded battery 21. The relay H2 is intermittently operated to break the shunt about the resistance coil l l loccasioning distinct clicks in the telephone receiver ol the calling subscriber. this resistance being then included in series with the upper winding of relay All When the called subscriber responds and maintains his. telephone receiver from its switch hoot: no click is manifested in the telephone oi the callin;- subscriber 0 ing to the opening; ol the circuit at the upper armature switch of relay li'. It the called sub scr ber should restore his tel phone receiver upon its snitch book before the calling subscriber re tores his receiver upon its switch hooh' another eircuit is established which includes circuit interrupter till. the uppermost armature switch of clay and its alternate tontact, the uppermost armature switch o! relay 97 and its conta t i te snpeiwisory relay 2%! and the l grounded batt ry .Fl, The circuit interrupters l i and HM are ot litle ent character so tlr the l l'l llltllt'ltri of interruption of the ircuit oi" the rela :2 are dilierent nhei'ehv the calling sob iriher xiii know when the 'it'ctlil including interrupter ltll is estahlislual. that the cal l subscriber has respond d and i'erloi ti his iijteitt'n upon its sn itch lEU-ih.

i lli e uipment associated with the called line is similar to that. asscciatctl with the calling: ii: and :slh'ilill parts have similar characr 12 ol rt-l'rrein-e At the bottom of Fig. t switch illustrated In in it i as it \\ill not be neces sary to w and the illustrati n ol' the con newtsnitch damn at the top ol' l ig. ii.

it n ill not litnecessary to show the nit-\hani m ol' the switches mployed for conncciint: the operalous telephone with the calling? lines. the switches employed for rliit'llilL' idle linlt circuit the connector switclnv employed l'or con-ipieliin g connec tions hetnecn calling and alled lines. since su h m chani m is well understood by these sltilled in the art. liel'errnre may be had to llritish Pul ld l'il o l l l and to Van llmentei s ",Ji l Ht Hf'J/"h. page for an nud landing: ol' the actual mechanical de ign iiirii t t be eiiipltrvetl.

it it ill e -r\'el that the onnector and i ii-twp: nilclie d clo ed by me lack t. cl W" that nere hitherto t ti dmiii tii pint'tltet n: lwiizm shown and particu' l l l larly described the preferred en'ibodiment of the invention I do not Wish to be limited to the precise details of construction and circuit arrangement shown as changes may readily be made without departing from the spirit of the invention.

Having thus described my invention I claim as new and desire to secure by Letters Patent the following 1. A tele ihone system including telephone lines extending from stations to an exchange; extensions for such telephone lines; an elevtro-magnetic line extending connectinggj dcvice; contrtiilling circuits for governing the association of said line extending connecting device and individual to the dill'eient posi' tions of the switching parts of said line extending connecting device; operator con-- trolled means for partially eflectin r modilication of selected controlling circuits for the purpose of arresting the switching part-i of the line extending connecting device in the positions correspondin to the controilin; circuits selected for modifi ation; apparatos governed by said controlling circuits for arresting the switching parts of the line extending connecting device and operated by such circuits when modified; and means governed by the line extending connecting device and brought nto aswieiation with said controlling circuits indiridiially whereby the apparatus for arresting;- the switching parts, of the line extending; emanating device is operated to arrest these sititehing partv in positions corresponding to the modified controlling circuits, there l-ei' r" present elecilw magnetic for operating the mechanism means governed by the line extendun connecting devi e tep by step. a circuit for this mechanism and means pyoeincd by the iln extending conne ting dciiuc l or interrupting: this circuit to z-ccasion th step h "mp operation of tin cleriro i; a tic a;

to lines extending l rtin tation, to at nisnr extensions tor .2. A telephone istt'in lll ill ii telephone lines;

an cit-o ii()-lll:tf flitll(' lin extending c nnecti' or vice; controllinef circuits for governing tin association of said line extending ltllilrt'lilifl device and individual to the dillereui po i tions oi the swit hing parts ol said line tending connecting ill-i ire: operator con trolled means for partially ell'cctiiie :nodih ration of selected controlling cu'wnits l'or tlo purpose of arresting the :%\\ll lti!if,1' parts l the lintextending ionnc tin dial r in the positions (itit'l'tsl tilltlillfi to thrlillttlll.'i;; circuits selected for modification; apparatu governed by said controlling c uits l t a resting the sw l l in part ol the line tending conneitirg devi'a and t t lfj tti such circuits when inmli ied: an; means governed by the line exam necting device and eper: U

the aforesaid operator controlled means for a circuit for this mechanism and means modifying selectcd controlling circuits and j governed by the line extending connecting brought into association with said controldevice for nterrupting this circuit to occaling circuits individually whereby the ap- I sion the step by step operation of the electroparatus for arresting the switching parts of magnetic mechanism.

the line extending connecting device is opl In witness whereof, I hereunto subscribe erat-ed to arrest these. switching parts in my name this 7th day of October A. 1).,1912.

positions corresponding to the modified, T Y controlling circuits, there being present! MORION electro-magnetic mechanism for operating Witnesses: the switching means governed by the line G. L. CRAGG,

extending connecting device step by step, ETTA L. WHITE. 

